SOLUTION OF SULPHATE OF CALCIUM.
Take of
| Sulphate of Calcium | 1 ounce |
| Distilled Water | 1 pint |
Rub the sulphate of calcium in a porcelain mortar for a few minutes with two ounces of the water, introduce the mixture thus obtained into a pint bottle containing the rest of the water, shake well several times, and allow the undissolved sulphate to subside. Filter.
SOLUTION OF SULPHYDRATE OF AMMONIUM.
Take of
| Solution of Ammonia | 5 fluid ounces |
Put three fluid ounces of the ammonia into a bottle, and conduct into this a stream of sulphuretted hydrogen as long as the gas continues to be absorbed; then add the remainder of the ammonia, and transfer the solution to a green-glass bottle furnished with a well-ground stopper.
SOLUTION OF TARTARIC ACID.
Take of
| Tartaric Acid, in crystals | 1 ounce |
| Distilled Water | 8 fluid ounces |
| Rectified Spirit | 2 fluid ounces |
Dissolve the tartaric acid in the water, add the rectified spirit, and preserve the solution in a stoppered bottle.
SOLUTION OF YELLOW CHROMATE OF POTASSIUM.
Take of
| Red Chromate of Potassium | 295 grains |
| Bicarbonate of Potassium | 200 grams |
| Distilled Water | 10 fluid ounces |
Dissolve the red chromate in the water, and exactly neutralise the solution with the bicarbonate, evolution of all carbonic acid being ensured by ebullition. Filter.
